FIELD: remote and local control of pneumatic and pneumohydraulic control of piston drives of ball cocks. SUBSTANCE: electropneumatic control unit includes pneumatic valves whose inlets are connected with pressure working medium source and outlets are connected with outlet valves of unit; proposed unit is also provided with electromagnets, reed magnetic limit switches, electromagnets and reed relays of limits switches which are arranged in one explosion-proof chamber and permanent movable magnets are located on the outside of this chamber; each magnet is connected with inlet member of unit by means of step-up two-stage leverage whose levers are spring-loaded. EFFECT: enhanced reliability. 2 cl, 6 dwg
